<template>
  <view class="uni-stat__select">
    <span v-if="label" class="uni-label-text hide-on-phone">{{label + '：'}}</span>
    <view class="uni-stat-box" :class="{'uni-stat__actived': current}">
      <view class="uni-select">
        <view class="uni-select__input-box" @click="toggleSelector">
          <view v-if="current" class="uni-select__input-text">{{current}}</view>
          <view v-else class="uni-select__input-text uni-select__input-placeholder">{{typePlaceholder}}</view>
          <uni-icons v-if="current && clear" type="clear" color="#c0c4cc" size="24" @click="clearVal" />
          <uni-icons v-else :type="showSelector? 'top' : 'bottom'" size="14" color="#999" />
        </view>
        <view class="uni-select--mask" v-if="showSelector" @click="toggleSelector" />
        <view class="uni-select__selector" v-if="showSelector">
          <view class="uni-popper__arrow"></view>
          <scroll-view scroll-y="true" class="uni-select__selector-scroll">
            <view class="uni-select__selector-empty" v-if="mixinDatacomResData.length === 0">
              <text>{{emptyTips}}</text>
            </view>
            <view v-else class="uni-select__selector-item" v-for="(item,index) in mixinDatacomResData" :key="index"
              @click="change(item)">
              <text :class="{'uni-select__selector__disabled': item.disable}">{{formatItemName(item)}}</text>
            </view>
          </scroll-view>
        </view>
      </view>
    </view>
  </view>
</template>

<script>
  /**
   * DataChecklist 数据选择器
   * @description 通过数据渲染的下拉框组件
   * @tutorial https://uniapp.dcloud.io/component/uniui/uni-data-select
   * @property {String} value 默认值
   * @property {Array} localdata 本地数据 ，格式 [{text:'',value:''}]
   * @property {Boolean} clear 是否可以清空已选项
   * @property {Boolean} emptyText 没有数据时显示的文字 ，本地数据无效
   * @property {String} label 左侧标题
   * @property {String} placeholder 输入框的提示文字
   * @event {Function} change  选中发生变化触发
   */

  export default {
    name: "uni-stat-select",
    mixins: [uniCloud.mixinDatacom || {}],
    data() {
      return {
        showSelector: false,
        current: '',
        mixinDatacomResData: [],
        apps: [],
        channels: []
      };
    },
    props: {
      localdata: {
        type: Array,
        default() {
          return []
        }
      },
      value: {
        type: [String, Number],
        default: ''
      },
      modelValue: {
        type: [String, Number],
        default: ''
      },
      label: {
        type: String,
        default: ''
      },
      placeholder: {
        type: String,
        default: '请选择'
      },
      emptyTips: {
        type: String,
        default: '无选项'
      },
      clear: {
        type: Boolean,
        default: true
      },
      defItem: {
        type: Number,
        default: 0
      }
    },
    created() {
      this.last = `${this.collection}_last_selected_option_value`
      if (this.collection && !this.localdata.length) {
        this.mixinDatacomEasyGet()
      }
    },
    computed: {
      typePlaceholder() {
        const text = {
          'opendb-stat-app-versions': '版本',
          'opendb-app-channels': '渠道',
          'opendb-app-list': '应用'
        }
        const common = this.placeholder
        const placeholder = text[this.collection]
        return placeholder ?
          common + placeholder :
          common
      }
    },
    watch: {
      localdata: {
        immediate: true,
        handler(val, old) {
          if (Array.isArray(val) && old !== val) {
            this.mixinDatacomResData = val
          }
        }
      },
      // #ifndef VUE3
      value() {
        this.initDefVal()
      },
      // #endif
      // #ifdef VUE3
      modelValue() {
        this.initDefVal()
      },
      // #endif
      mixinDatacomResData: {
        immediate: true,
        handler(val) {
          if (val.length) {
            this.initDefVal()
          }
        }
      }
    },
    methods: {
      initDefVal() {
        let defValue = ''
        if ((this.value || this.value === 0) && !this.isDisabled(this.value)) {
          defValue = this.value
        } else if ((this.modelValue || this.modelValue === 0) && !this.isDisabled(this.modelValue)) {
          defValue = this.modelValue
        } else {
          let strogeValue
          if (this.collection) {
            strogeValue = uni.getStorageSync(this.last)
          }
          if (strogeValue || strogeValue === 0) {
            defValue = strogeValue
          } else {
            let defItem = ''
            if (this.defItem > 0 && this.defItem < this.mixinDatacomResData.length) {
              defItem = this.mixinDatacomResData[this.defItem - 1].value
            }
            defValue = defItem
          }
          this.emit(defValue)
        }
        const def = this.mixinDatacomResData.find(item => item.value === defValue)
        this.current = def ? this.formatItemName(def) : ''
      },

      /**
       * @param {[String, Number]} value
       * 判断用户给的 value 是否同时为禁用状态
       */
      isDisabled(value) {
        let isDisabled = false;

        this.mixinDatacomResData.forEach(item => {
          if (item.value === value) {
            isDisabled = item.disable
          }
        })

        return isDisabled;
      },

      clearVal() {
        this.emit('')
        if (this.collection) {
          uni.removeStorageSync(this.last)
        }
      },
      change(item) {
        if (!item.disable) {
          this.showSelector = false
          this.current = this.formatItemName(item)
          this.emit(item.value)
        }
      },
      emit(val) {
        this.$emit('change', val)
        this.$emit('input', val)
        this.$emit('update:modelValue', val)
        if (this.collection) {
          uni.setStorageSync(this.last, val)
        }
      },

      toggleSelector() {
        this.showSelector = !this.showSelector
      },
      formatItemName(item) {
        let {
          text,
          value,
          channel_code
        } = item
        channel_code = channel_code ? `(${channel_code})` : ''
        return this.collection.indexOf('app-list') > 0 ?
          `${text}(${value})` :
          (
            text ?
              text :
              `未命名${channel_code}`
          )
      }
    }
  }
</script>

<style lang="scss">
  $uni-base-color: #6a6a6a !default;
  $uni-main-color: #333 !default;
  $uni-secondary-color: #909399 !default;
  $uni-border-3: #e5e5e5;


  /* #ifndef APP-NVUE */
  @media screen and (max-width: 500px) {
    .hide-on-phone {
      display: none;
    }
  }

  /* #endif */
  .uni-stat__select {
    display: flex;
    align-items: center;
    // padding: 15px;
    cursor: pointer;
    width: 100%;
    flex: 1;
    box-sizing: border-box;
  }

  .uni-stat-box {
    width: 100%;
    flex: 1;
  }

  .uni-stat__actived {
    width: 100%;
    flex: 1;
    // outline: 1px solid #2979ff;
  }

  .uni-label-text {
    font-size: 14px;
    font-weight: bold;
    color: $uni-base-color;
    margin: auto 0;
    margin-right: 5px;
  }

  .uni-select {
    font-size: 26.66rpx;
    border: 1px solid $uni-border-3;
    box-sizing: border-box;
    border-radius: 4px;
    padding: 0 5px;
    padding-left: 10px;
    position: relative;
    /* #ifndef APP-NVUE */
    display: flex;
    user-select: none;
    /* #endif */
    flex-direction: row;
    align-items: center;
    border-bottom: solid 1px $uni-border-3;
    width: 100%;
    flex: 1;
    height: 76rpx;
    margin-top: 10rpx;
  }

  .uni-select__label {
    font-size: 16px;
    // line-height: 22px;
    height: 35px;
    padding-right: 10px;
    color: $uni-secondary-color;
  }

  .uni-select__input-box {
    // height: 35px;
    position: relative;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex: 1;
    flex-direction: row;
    align-items: center;
  }

  .uni-select__input {
    flex: 1;
    font-size: 14px;
    height: 22px;
    line-height: 22px;
  }

  .uni-select__input-plac {
    font-size: 14px;
    color: $uni-secondary-color;
  }

  .uni-select__selector {
    /* #ifndef APP-NVUE */
    box-sizing: border-box;
    /* #endif */
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    width: 100%;
    background-color: #FFFFFF;
    border: 1px solid #EBEEF5;
    border-radius: 6px;
    box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
    z-index: 2;
    padding: 4px 0;
    z-index: 9999;
  }

  .uni-select__selector-scroll {
    /* #ifndef APP-NVUE */
    max-height: 200px;
    box-sizing: border-box;
    /* #endif */
  }

  .uni-select__selector-empty,
  .uni-select__selector-item {
    /* #ifndef APP-NVUE */
    display: flex;
    cursor: pointer;
    /* #endif */
    line-height: 35px;
    font-size: 14px;
    text-align: left;
    /* border-bottom: solid 1px $uni-border-3; */
    padding: 0px 10px;
  }

  .uni-select__selector-item:hover {
    background-color: #f9f9f9;
  }

  .uni-select__selector-empty:last-child,
  .uni-select__selector-item:last-child {
    /* #ifndef APP-NVUE */
    border-bottom: none;
    /* #endif */
  }

  .uni-select__selector__disabled {
    opacity: 0.4;
    cursor: default;
  }

  /* picker 弹出层通用的指示小三角 */
  .uni-popper__arrow,
  .uni-popper__arrow::after {
    position: absolute;
    display: block;
    width: 0;
    height: 0;
    border-color: transparent;
    border-style: solid;
    border-width: 6px;
  }

  .uni-popper__arrow {
    filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.03));
    top: -6px;
    left: 10%;
    margin-right: 3px;
    border-top-width: 0;
    border-bottom-color: #EBEEF5;
  }

  .uni-popper__arrow::after {
    content: " ";
    top: 1px;
    margin-left: -6px;
    border-top-width: 0;
    border-bottom-color: #fff;
  }

  .uni-select__input-text {
    // width: 280px;
    width: 100%;
    color: $uni-main-color;
    white-space: nowrap;
    text-overflow: ellipsis;
    -o-text-overflow: ellipsis;
    overflow: hidden;
  }

  .uni-select__input-placeholder {
    color: $uni-base-color;
    font-size: 14px;
  }

  .uni-select--mask {
    position: fixed;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
  }
</style>